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System and method for sensing the level and composition of liquid in a fuel tank

  • US 7,926,341 B2
  • Filed: 05/10/2006
  • Issued: 04/19/2011
  • Est. Priority Date: 05/10/2005
  • Status: Expired due to Fees
First Claim
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1. A method of sensing a property of a fuel in a fuel tank, said method comprising:

  • (a) generating an RF signal at an operating frequency;

    (b) coupling the RF signal to a resonant circuit, the resonant circuit having a resonant frequency and including an inductor positioned proximate to the fuel in the fuel tank; and

    (c) measuring a change in an electrical parameter associated with the resonant circuit caused by a variation in at least one electrical property of the fuel proximate to the inductor as a function of composition of said fuel.

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